Dolphins coach Joe Philbin was cryptic on the heels of Saturday night's 25-20 preseason win over the Cowboys, a contest that saw Moreno rip through Dallas for 64 yards off 10 carries in his first game action since last season.

"We haven't released anything," Philbin later said of his backfield depth chart, per ESPN.com's James Walker. "We're still evaluating right up until we name our starter. I thought (Moreno) played well."

Moreno is coming off a career year that saw him rumble for 1,038 yards and 10 touchdowns in Denver's runner-friendly scheme. Miller, meanwhile, is looking to bounce back from a disappointing campaign in 2013.

The arrival of play-caller Bill Lazor suggests production for both backs, but Moreno's hot-and-cold offseason had Miller primed to lead the way. It's telling that one strong showing from Moreno has Miami's coaching staff weighing its options.